Geometry: The circle - circumference and relationships with radius and diameter

Reason For Learning

The distance around a circle can be hard to measure, especially if all you have is a ruler to help you out. This bite explains how the distance around a circle can be calculated if you know how wide the circle is. An understanding of the relationship between circumference and radius is important for future studies of circular functions (VCE maths) as radian units are used extensively.

Learning Intention

In this bite, you will learn the rule for circumference, the link between radius and diameter and you may complete a practical activity that uses string to measure the distance around the circle and its diameter.

Key Vocabulary Terms

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ACMMG197 Level 8

Investigate the relationship between features of circles such as circumference, area, radius and diameter. Use formulas to solve problems involving circumference and area